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An inspection of these equations shows that 2KMO react with 10FeSO , while K Cr O reacts with 6FeSO . These are not equivalent, but if the first equation is multiplied by 3 and the second by 5 the number of molecules of FeSO is then the same in both, and the number of molecules of KMnO and K Cr O reacting with these 30 molecules become 6 and 5 respectively.
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